Of course, we can explain why we use such a scheme. The public blockchain is highly decentralized because anyone can participate in the consensus process without restrictions, but since it is possible to participate without restrictions, the processing speed during the consensus process may be slow, making it unreasonable for practical use.

Private blockchain allows only authorized users to participate, so consensus processing speed is fast.

However, due to the limited number of users who can participate, the scalability is low, and the centralization exists, so it is vulnerable to security, and it is free from decentralization, which is the basic philosophy of the blockchain.

We focused on designing a complete blockchain by combining only the strengths of each chain, and the shell-core structure was made.